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000738: At least one statistical result was invalid (NaN). Check the VIF values to determine whether near perfect multicollinearity is present.


Poor models with extreme multicollinearity will occasionally produce invalid test statistics.


Look for extreme multicollinearity (redundancy in the explanatory variables) by examining the VIF values. Remove variables that are redundant, as indicated by VIF values larger than about seven. If the VIF values do not indicate a multicollinearity problem, make sure the dependent variable is specified correctly.